LA - Leaf Area Index (LAI) and Radiation Measurements

Form: PLA - Plot based information

Active since: 2009 Last change: 2018

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!Sequence; code_country; code_plot; survey_id; latitude; longitude; code_altitude; slope; exposition; date_measure; date_maxfol; code_determination; lai_max_plot; pai_eff; sai_plot; date_sai; gap_fraction_plot; code_software; code_clumping_method; alpha; gamma; omega_plot; rings; mean_element_width; other_observations

POSITION FIELD DESCRIPTION
1 Sequence

Description: Continuous number to identify the line of the submitted file
Format: I
2 code_country
M K

Description: ID of the country
Format: I
Dictionary: d_country
3 code_plot (integer)
M K

Description: Observation plot number
Remarks: A unique number (per country) given to the permanent plot during the selection or installation
Format: I
4 survey_id (integer)
M K

Description: LAI survey ID
Format: I
Explanatory Item: 191
5 latitude (+DDMMSS)
M

Description: Latitude in Degrees Minutes Seconds (WGS84)
Remarks: E.g. '+505852' = 50 Degree, 58 Minutes, 52 Seconds
Format: C
Explanatory Item: 4
6 longitude (+/-DDMMSS)
M

Description: Longitude in Degrees Minutes Seconds (WGS84)
Remarks: E.g. '+035531' = 3 Degree, 55 Minutes, 31 Seconds
Format: C
Explanatory Item: 4
7 code_altitude (m)
M

Description: Altitude above sea level in 50 meter classes
Format: I
Dictionary: d_altitude
8 slope (degree)
M

Description: Slope of the plot
Format: I
9 exposition (degree)
M

Remarks: 360 degree (North=0)
Format: I
10 date_measure (DDMMYY)
M K

Description: Date of LAI measurement
Remarks: E.g. '19th July 2012' = '190712' /// Not Date of SAI measurement
Format: Date
11 date_maxfol (DDMMYY)
M

Description: Date of maximum foliation
Remarks: E.g. '31st July 2012' = '310712'
Format: Date
Explanatory Item: 193
12 code_determination (code)
M

Description: Method of determination
Format: I
Dictionary: d_determination_la
13 lai_max_plot (m²/m²)
M

Description: Plot-representative LAI at the date of maximum foliation, i.e. mean LAI_max_point over all points or sum of LAI_max_species over all species
Format: F
Explanatory Item: 194
14 pai_eff (m²/m²)

Description: PAIeff at date of LAI mesurement
Format: F
15 sai_plot (m²/m²)

Description: Stem area index from measurements in the leafless stage in winter (if used in LAImax-calculation), i.e. mean of sai_point over all points
Format: F
16 date_sai (DDMMYY)

Description: Date of related SAI measurement
Remarks: E.g. '19th October 2012' = '191012' /// winter, if applicable
Format: Date
Explanatory Item: 197
17 gap_fraction_plot (%)

Description: Measured gap fraction - plot representative value
Format: F
18 code_software

Description: Used software for evaluation of hemispherical photographs
Format: I
Dictionary: d_software
19 code_clumping_method

Description: Method used to derive omega
Remarks: Hemispherical photography or TRAC
Format: I
Dictionary: d_clumping_method
20 alpha (fraction (0-1))

Description: Woody to total plant area ratio used in LAImax calculation
Format: F
21 gamma (fraction (0-1))

Description: Needle to shoot area ratio used in clumping correction
Remarks: equals 1 in the case of broadleaf tree species
Format: F
22 omega_plot (fraction (0-1))

Description: Clumping coefficient used in clumping correction
Format: F
23 rings

Description: Number of rings for calculation of PAIeff
Format: I
24 mean_element_width (cm)

Description: Mean element width in cm used for TRAC
Format: I
25 other_observations (FREE TEXT)

DB Column: other_obs
Description: Supplementary comments
Format: C

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